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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Oct. 31, 2014
Related Party Transaction [Line Items]      
Document Period End Date Jun. 30, 2016    
Line of Credit [Member] | Brightstar [Member]      
Related Party Transaction [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 1,000
Brightstar [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Expenses from Transactions with Related Party $ 19 $ 33